Congratulations on publishing your book. Do let me know if you ever do an English translation.
In my opinion
- It is easy to remove Adobe DRM. So if you use Adobe DRM you are in effect giving it away to those who know how to remove it's DRM. It won't upset them that you have used DRM.
- Most people who don't know how to use DRM or and don't want to move their books to other readers they buy won't care if you use DRM - until they buy a new reader and want to move your ebook. They will resent it if they have to buy another copy.
- So I think the chances of irritating people is higher if you use DRM than if you don't, and it has little or any benefit to you.